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Report No.
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Time-dependent behaviour analysis and identification of factors affecting radiocaesium transfer to separate sewers in Fukushima Prefecture

Pratama, M. A.; Takahara, Shogo; Munakata, Masahiro; Yoneda, Minoru*

The time-dependent behavior analysis, parameterization, and the identification of factors affecting parameter values of radiocesium in sludges of 10 sewer systems in Fukushima Prefecture were attempted. It was obtained that the time-dependent cesium concentration follows two exponentials model consisting of the fast and slow transfer coefficient of cesium from ground surfaces to sewer systems and their statistical coefficients. Whereas values for the transfer coefficients are relatively the same between the sewer systems, the values of statistical coefficients significantly vary depending on the specific characteristic of each sewer's service area. Further analysis shows that decontamination activity and land use on each sewer's service area play important roles in determining the value of statistical coefficients.

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